What river flows from the gulf of mexico through the entire length of the united states?

D, the answer is letter d. because even though fossil fuels take a very long time to form, they do form in the ground just like coal and others.

The circumcenter is  equidistant  from each vertex of the triangle. the circumcenter is at the  intersection  of the  perpendicular bisectors  of the triangle's sides. the circumcenter of a right triangle falls on the side opposite the right  angle. the incenter  of a triangle is always inside it.

C.     is the right answer because it is ask about the soil types has the richest in organic material.

good luck